About: http://webisa.webdatacommons.org/110875357

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	There are many different grey iron grades in different countries and standards, however, most of grades have same requirements to the mechanical properties, especially to tensile strength.
http://www.w3.org/ns/prov#wasQuotedFrom	iron-foundry.com